"This has been suggested as an explanation for the preponderance of retrograde moons around Jupiter. Because Saturn has a more even mix of retrograde/prograde moons, however, the underlying causes appear to be more complex. With the exception of Hyperion all the known regular planetary natural satellites in the Solar System are tidally locked to their host planet, so they have zero rotation relative to their host planet, but have the same type of rotation relative to the Sun as their host planet, because they have prograde orbits around their host planet. That is to say, they all have prograde rotation"
"largest of Uranus's satellites, Titania, has a radius of only , or less than half that of the Moon, but slightly more than Rhea, the second-largest satellite of Saturn, making Titania the eighth-largest moon in the Solar System. Uranus's satellites have relatively low albedos; ranging from 0.20 for Umbriel to 0.35 for Ariel (in green light). They are ice–rock conglomerates composed of roughly 50% ice and 50% rock. The ice may include ammonia and carbon dioxide. Among the Uranian satellites, Ariel appears to have the youngest surface with the fewest impact craters and Umbriel's the oldest. Miranda has fault canyons"
"moon, Rhea, may have a tenuous ring system of its own, along with a tenuous atmosphere. Many of the other moons are small: 34 are less than 10 km in diameter and another 14 between 10 and 50 km in diameter. Traditionally, most of Saturn's moons have been named after Titans of Greek mythology. Titan is the only satellite in the Solar System with a major atmosphere, in which a complex organic chemistry occurs. It is the only satellite with hydrocarbon lakes. On 6 June 2013, scientists at the IAA-CSIC reported the detection of polycyclic aromatic hydrocarbons in the upper"
"Theia In Greek mythology, Theia (; , also rendered Thea or Thia), also called Euryphaessa ""wide-shining"", is a Titaness. Her brother/consort is Hyperion, a Titan and god of the sun, and together they are the parents of Helios (the Sun), Selene (the Moon), and Eos (the Dawn). The name ""Theia"" alone means simply ""goddess"" or ""divine""; ""Theia Euryphaessa"" () brings overtones of extent (, ""eurys"", ""wide"", root: ) and brightness (, ""phaos"", ""light"", root: φαεσ-). Hesiod's ""Theogony"" gives her an equally primal origin, said to be the eldest daughter of Gaia (Earth) and Uranus (Sky). Robert Graves also relates that"
"of significance were made until 1789 when William Herschel discovered two further moons, Mimas and Enceladus. The irregularly shaped satellite Hyperion, which has a resonance with Titan, was discovered in 1848 by a British team. In 1899 William Henry Pickering discovered Phoebe, a highly irregular satellite that does not rotate synchronously with Saturn as the larger moons do. Phoebe was the first such satellite found and it takes more than a year to orbit Saturn in a retrograde orbit. During the early 20th century, research on Titan led to the confirmation in 1944 that it had a thick atmosphere –"
"Hyperion (mythology) In Greek mythology, Hyperion (; , ""The High-One"") was one of the twelve Titan children of Gaia (Earth) and Uranus (Sky) who, led by Cronus, overthrew their father Uranus and were themselves later overthrown by the Olympians. With his sister, the Titaness Theia, Hyperion fathered Helios (Sun), Selene (Moon) and Eos (Dawn). Keats's abandoned epic poem ""Hyperion"" is among the literary works that feature the figure. Hyperion's son Helios was referred to in early mythological writings as ""Helios Hyperion"" (, ""Sun High-one""). In Homer's ""Odyssey"", Hesiod's ""Theogony"" and the Homeric ""Hymn to Demeter"", the Sun is once in"
"was regarded as the ""first principle"" by Emperor Julian, though his relevance in Julian's notions of theurgy is unknown. Hyperion (mythology) In Greek mythology, Hyperion (; , ""The High-One"") was one of the twelve Titan children of Gaia (Earth) and Uranus (Sky) who, led by Cronus, overthrew their father Uranus and were themselves later overthrown by the Olympians. With his sister, the Titaness Theia, Hyperion fathered Helios (Sun), Selene (Moon) and Eos (Dawn). Keats's abandoned epic poem ""Hyperion"" is among the literary works that feature the figure. Hyperion's son Helios was referred to in early mythological writings as ""Helios Hyperion"""
"coincident with its rotational period. In other words, Titania is a synchronous or tidally locked satellite, with one face always pointing toward the planet. Titania's orbit lies completely inside the Uranian magnetosphere. This is important, because the trailing hemispheres of satellites orbiting inside a magnetosphere are struck by magnetospheric plasma, which co-rotates with the planet. This bombardment may lead to the darkening of the trailing hemispheres, which is actually observed for all Uranian moons except Oberon (see below). Because Uranus orbits the Sun almost on its side, and its moons orbit in the planet's equatorial plane, they (including Titania) are"
"to ""celebrate life on the Pale Blue Dot"". On February 10, 2015, the ""Cassini"" spacecraft visited Rhea more closely, coming within . The spacecraft observed the moon with its cameras producing some of the highest resolution color images yet of Rhea. ""Cassini"" performed its latest flyby of Saturn's moon Hyperion on May 31, 2015, at a distance of about . ""Cassini"" performed its last flyby of Saturn's moon Dione on August 17, 2015, at a distance of about . A previous flyby was performed on June 16. Between 2012 and 2016, the persistent hexagonal cloud pattern at Saturn's north pole"
"satellites orbiting Rhea could have stable orbits. Furthermore, the suspected rings are thought to be narrow, a phenomenon normally associated with shepherd moons. However, targeted images taken by the ""Cassini"" spacecraft failed to detect rings around Rhea. It has also been proposed that Saturn's moon Iapetus had a satellite in the past; this is one of several hypotheses that have been put forward to account for its equatorial ridge. Two natural satellites are known to have small companions at both their and Lagrangian points, sixty degrees ahead and behind the body in its orbit. These companions are called trojan moons,"
"the ancient lunar deity Selene, daughter of the Titans Hyperion and Theia. Claiming to have already been old when modern mankind was just emerging, Selene was born over 17,000 years ago somewhere in what is now Central Europe, ""after the Oceans swallowed Atlantis and before the rise of the Aryas"". Her tribe's elders recognized her for what she was and commanded the entire tribe, including her own mother, to sacrifice their lives to feed her. Selene was revealed to have been an old enemy of the sorcerer Kulan Gath. Kulan Gath was active during the Hyborian Age (before any recorded"
"less than half that of Triton (the seventh-largest moon in the Solar System) alone. The largest of the satellites, Titania, has a radius of 788.9 km, or less than half that of the Moon, but slightly more than that of Rhea, the second-largest moon of Saturn, making Titania the eighth-largest moon in the Solar System. Uranus is about 10,000 times more massive than its moons. As of 2016, Uranus is known to have 13 inner moons. Their orbits lie inside that of Miranda. All inner moons are intimately connected to the rings of Uranus, which probably resulted from the fragmentation"
"ice giants. Some asteroids share the same names as moons of Saturn: 55 Pandora, 106 Dione, 577 Rhea, 1809 Prometheus, 1810 Epimetheus, and 4450 Pan. In addition, two more asteroids previously shared the names of Saturnian moons until spelling differences were made permanent by the International Astronomical Union (IAU): Calypso and asteroid 53 Kalypso; and Helene and asteroid 101 Helena. Saturn's satellite system is very lopsided: one moon, Titan, comprises more than 96% of the mass in orbit around the planet. The six other planemo (ellipsoidal) moons constitute roughly 4% of the mass, and the remaining 55 small moons, together"
"discovered by direct observation using optical telescopes. Saturn's largest moon, Titan, was discovered in 1655 by Christiaan Huygens using a objective lens on a refracting telescope of his own design. Tethys, Dione, Rhea and Iapetus (the ""Sidera Lodoicea"") were discovered between 1671 and 1684 by Giovanni Domenico Cassini. Mimas and Enceladus were discovered in 1789 by William Herschel. Hyperion was discovered in 1848 by W.C. Bond, G.P. Bond and William Lassell. The use of long-exposure photographic plates made possible the discovery of additional moons. The first to be discovered in this manner, Phoebe, was found in 1899 by W.H. Pickering."
"daughter of the Titans Hyperion and Theia), the daughter of a Pallas, son of (otherwise unknown) Megamedes, which is possibly the same as this Pallas. Ovid uses the patronymic ""Pallantias"" or ""Pallantis"" as another name for Aurora, the Roman equivalent of the Greek Eos (""Dawn""), who was the sister of Selene; Ovid apparently regarding Aurora (or Eos) as the daughter of (or otherwise related to) Pallas. The ""Suda"" in discussing Athena's epithet ""Pallas"" suggests a possible derivation ""from brandishing (""pallein"") the spear"". The geographer Pausanias reports that Pellene, a city in Achaea, was claimed by its inhabitants to be named"
"and in planetary systems beyond the Solar System. Nonetheless, no ""moon of a moon"" or subsatellite is known in the Solar System or beyond the Solar System. In most cases, the tidal effects of the planet would make such a system unstable. The possible detection of a ring system around Saturn's natural satellite Rhea led to calculations that indicated that satellites orbiting Rhea would have stable orbits. Furthermore, the suspected rings are thought to be narrow, a phenomenon normally associated with shepherd moons. However, targeted images taken by the ""Cassini"" spacecraft failed to detect any subsatellites or rings associated with"
"was among four Saturnian moons labelled the ""Sidera Lodoicea"" by their discoverer Giovanni Cassini after King Louis XIV (the other three were Tethys, Dione and Rhea). However, astronomers fell into the habit of referring to them using Roman numerals, with Iapetus being Saturn V. Once Mimas and Enceladus were discovered in 1789, the numbering scheme was extended and Iapetus became Saturn VII. And with the discovery of Hyperion in 1848, Iapetus became ""Saturn VIII"", which it is still known by today (see naming of natural satellites). Geological features on Iapetus are named after characters and places from the French epic"
"the Hegemony is also managed by a chief executive officer advised by the TechnoCore advisory council and the Hegemony Senate. All the 'Core's advice and predictions are confounded by mysterious structures on the remote colony world Hyperion (named after the moon of Saturn) that are commonly regarded as the Time Tombs. The tombs are encased in an anti-entropic field that is theorised to be carrying them backwards in time (suggesting that the tombs were built in the distant future for some unknown purpose) and are said to be guarded by a legendary time travelling creature known as the Shrike. The"
"Helios Helios (; ""Hēlios""; Latinized as ""Helius""; in Homeric Greek) is the god and personification of the Sun in Greek mythology. He is the son of the Titan Hyperion and the Titaness Theia (according to Hesiod), also known as Euryphaessa (in ""Homeric Hymn 31"") and brother of the goddesses Selene, the moon, and Eos, the dawn. Helios was described as a handsome young man crowned with the shining aureole of the Sun, who drove the chariot of the sun across the sky each day to earth-circling Oceanus and through the world-ocean returned to the East at night. In the ""Homeric"
"in 2010 and 2011. Dia (moon) Dia (), also known as Jupiter LIII, is a prograde irregular satellite of Jupiter. Provisionally known as S/2000 J 11, it received its name on March 7, 2015. It is named after Dia, daughter of Deioneus (or Eioneus), wife of Ixion. According to Homer, she was seduced by Zeus in stallion form; Pirithous was the issue. The satellite is one of the three known small bodies in the Himalia group, the other two being S/2018 J 1 and S/2017 J 4. Dia is thought to be about 4 kilometres in diameter. It orbits Jupiter"
"Titan (Varley novel) Titan is a science fiction novel by American writer John Varley, the first book in his Gaea Trilogy, published in 1979. It won the 1980 Locus Award for Best Science Fiction Novel and was nominated for both the Nebula Award for Best Novel in 1979, and the Hugo Award for Best Novel in 1980. 1979 A scientific expedition to the planet Saturn in 2025, aboard the ship ""Ringmaster"", discovers a strange satellite in orbit around the planet. Commanding the ship is Cirocco Jones, a tall NASA career woman, aided by astronomer Gaby Plauget, the clone twin physicists"
"the Titans Hyperion and Perseis. Circe is a powerful witch and former princess of Colchis. A beautiful, violet-haired, red-eyed sorceress, she is known for turning people into animals (which are called bestiamorphs), as well as for powers of mind control. Circe has been a devoted follower of the goddess Hecate for thousands of years. She has lived on the island of Aeaea where she became a powerful being in both magic and in influence over portions of man's world. During his adventure to her island, Circe fell in love with Odysseus and bore him three sons: Agrius, Latinus, and Telegonus."
"of an asteroid from a heliocentric orbit is not always permanent. According to simulations, temporary satellites should be a common phenomenon. The only observed example is , which was a temporary satellite of Earth for nine months in 2006 and 2007. Most regular moons (natural satellites following relatively close and prograde orbits with small orbital inclination and eccentricity) in the Solar System are tidally locked to their respective primaries, meaning that the same side of the natural satellite always faces its planet. The only known exception is Saturn's natural satellite Hyperion, which rotates chaotically because of the gravitational influence of"
"Ligeia Mare. In 2015, the NASA Innovative Advanced Concepts program (NIAC) awarded a Phase II grant to a design study of a submarine to explore the seas of Titan. Ligeia Mare Ligeia Mare is a lake in the north polar region of Titan, the planet Saturn's largest moon. It is the second largest body of liquid on the surface of Titan, after Kraken Mare. Larger than Lake Superior on Earth, it is mostly composed of liquid methane, with unknown but lesser components of dissolved nitrogen and ethane, as well as other organic compounds. It is located at 78° N, 249°"
"Dia (moon) Dia (), also known as Jupiter LIII, is a prograde irregular satellite of Jupiter. Provisionally known as S/2000 J 11, it received its name on March 7, 2015. It is named after Dia, daughter of Deioneus (or Eioneus), wife of Ixion. According to Homer, she was seduced by Zeus in stallion form; Pirithous was the issue. The satellite is one of the three known small bodies in the Himalia group, the other two being S/2018 J 1 and S/2017 J 4. Dia is thought to be about 4 kilometres in diameter. It orbits Jupiter at an average distance"
"Solar System. However, the color asymmetry of Titania is more likely related to accretion of a reddish material coming from outer parts of the Uranian system, possibly, from irregular satellites, which would be deposited predominately on the leading hemisphere. Scientists have recognized three classes of geological feature on Titania: craters, chasmata (canyons) and rupes (scarps). The surface of Titania is less heavily cratered than the surfaces of either Oberon or Umbriel, which means that the surface is much younger. The crater diameters reach 326 kilometers for the largest known crater, Gertrude (there can be also a degraded basin of approximately"
"attempt to return to Earth, the Titans transform a nearby moon into ""New Cronus,"" and begin to guide the primitive race on the nearby planet Synriannaq. Being the only Titan without a spouse, Rhea mates many times with these primitives; the resulting demigods make war on the planet. After 3,000 years pass, the Titans abandon all hope of guiding that world. However, these gods are still driven to bequeath their power to sentients; to this end, Rhea sacrifices herself and sends her own energy out into the universe. Her power falls upon several worlds and ""seeds"" a child from each."
"Rhea (mythology) Rhea (; Ancient Greek: Ῥέα ) is a character in Greek mythology, the Titaness daughter of the earth goddess Gaia and the sky god Uranus as well as sister and wife to Cronus. In early traditions, she is known as ""the mother of gods"" and therefore is strongly associated with Gaia and Cybele, who have similar functions. The classical Greeks saw her as the mother of the Olympian gods and goddesses, but not as an Olympian goddess in her own right. The Romans identified her with Magna Mater (their form of Cybele), and the Goddess Ops. Most ancient"
"Selene In Greek mythology, Selene (; ""Moon"") is the goddess of the moon. She is the daughter of the Titans Hyperion and Theia, and sister of the sun-god Helios, and Eos, goddess of the dawn. She drives her moon chariot across the heavens. Several lovers are attributed to her in various myths, including Zeus, Pan, and the mortal Endymion. In classical times, Selene was often identified with Artemis, much as her brother, Helios, was identified with Apollo. Selene and Artemis were also associated with Hecate, and all three were regarded as lunar goddesses, but only Selene was regarded as the"
"the Fairies in ""A Midsummer Night's Dream"". The names of all four satellites of Uranus then known were suggested by Herschel's son John in 1852, at the request of William Lassell, who had discovered the other two moons, Ariel and Umbriel, the year before. Titania was initially referred to as ""the first satellite of Uranus"", and in 1848 was given the designation ' by William Lassell, although he sometimes used William Herschel's numbering (where Titania and Oberon are II and IV). In 1851 Lassell eventually numbered all four known satellites in order of their distance from the planet by Roman"
"Medea In Greek mythology, Medea (; , ""Mēdeia"", ) is the daughter of King Aeëtes of Colchis, a niece of Circe and the granddaughter of Helios, the sun god begat by the Titan Hyperion. Medea figures in the myth of Jason and the Argonauts, appearing in Hesiod's ""Theogony"" around 700 BC, but best known from a 3rd century BC literary version by Apollonius of Rhodes called the ""Argonautica"". Medea is known in most stories as a sorceress and is often depicted as a priestess of the goddess Hecate. There have been many different accounts of Medea's family tree. One of"
"carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, ""Merope"" measures between 60.439 and 74.36 kilometers in diameter and its surface has an albedo between 0.03 and 0.053. The ""Collaborative Asteroid Lightcurve Link"" derives an albedo of 0.0358 and a diameter of 67.11 kilometers based on an absolute magnitude of 10.1. This minor planet was named after the nymph Merope from Greek mythology. She is one of the seven Pleiades, daughters of the Titan Atlas and the sea-nymph Pleione (). Merope is also a bright star in the constellation"
"a noticeably oblate spheroid shape, with an average diameter of 444 ± 35 km and a semimajor axis ratio of 1.11. This is much more than for the other objects in the ""big four""—2 Pallas, 4 Vesta and the dwarf planet Ceres. Aside from being the smallest of the four, Hygiea, like Ceres, has a relatively low density, which is more comparable to the icy satellites of Jupiter or Saturn than to the terrestrial planets or the stony asteroids. Although it is the largest body in its region, due to its dark surface and farther-than-average distance from the Sun, Hygiea"